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digitalmars.D.bugs - [Issue 3421] New: Inline assembler problems accessing static variables

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=3421

           Summary: Inline assembler problems accessing static variables
           Product: D
           Version: 2.035
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: grahamc001uk yahoo.co.uk


--- Comment #0 from Graham <grahamc001uk yahoo.co.uk> 2009-10-19 08:03:19 PDT
---
This code works in DMD v1.047 and fails in DMD v2.035

import std.stdio;

static int value1;

void main() {
    value1 = 2;
    asm {
        mov        EAX,1;
        mov        [value1],EAX;
    }
    writefln("value1 %d", value1);
}

The code generated in each case is:

Compiled under DMD v 1.047:

 u __Dmain l39

0x00402010 55 push ebp 0x00402011 8bec mov ebp,esp 0x00402013 c705801445000200 0000 mov dword ptr [_D6test036value1i (00451480)],00000002 0x0040201d b801000000 mov eax,00000001 0x00402022 a380144500 mov dword ptr [_D6test036value1i (00451480)],eax 0x00402027 ff3580144500 push dword ptr [_D6test036value1i (00451480)] 0x0040202d ff3594b04400 push dword ptr [_TMP0+00000004 (0044b094)] 0x00402033 ff3590b04400 push dword ptr [_TMP0 (0044b090)] 0x00402039 b8f0b04400 mov eax,0044b0f0 0x0040203e 50 push eax 0x0040203f e830170000 call _D3std5stdio8writeflnFYv (00403774) 0x00402044 83c410 add esp,10 0x00402047 5d pop ebp 0x00402048 c3 retn
 

Compiled under DMD v 2.0035:
 u __Dmain l43

0x00402010 55 push ebp 0x00402011 8bec mov ebp,esp 0x00402013 53 push ebx 0x00402014 64a12c000000 mov eax,dword ptr fs:[0000002c] 0x0040201a 8b08 mov ecx,dword ptr [eax] 0x0040201c c781040000000200 0000 mov dword ptr [ecx+00000004],00000002 0x00402026 b801000000 mov eax,00000001 0x0040202b a304000000 mov dword ptr [00000004],eax 0x00402030 ff3594904200 push dword ptr [_TMP0+00000004 (00429094)] 0x00402036 ff3590904200 push dword ptr [_TMP0 (00429090)] 0x0040203c 648b152c000000 mov edx,dword ptr fs:[0000002c] 0x00402043 8b1a mov ebx,dword ptr [edx] 0x00402045 8b8304000000 mov eax,dword ptr [ebx+00000004] 0x0040204b e804000000 call _D3std5stdio19__T8writeflnTAyaTiZ8writeflnFAyaiZv (00402054) 0x00402050 5b pop ebx 0x00402051 5d pop ebp 0x00402052 c3 retn

The "D" code accesses 'value1' as dword ptr [ecx+00000004] and the inline assember as dword ptr [00000004] Is this a change in the language runtime specification for how module static variables are accessed or it this a bug ? -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Oct 19 2009
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=3421


Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |clugdbug yahoo.com.au


--- Comment #1 from Don <clugdbug yahoo.com.au> 2009-10-19 08:37:32 PDT ---
It's a change. statics are now thread-local by default. You need to mark as
__gshared if you want the D1 behaviour.

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--- Comment #2 from Graham <grahamc001uk yahoo.co.uk> 2009-10-20 15:29:29 PDT
---
Thanks.

Is there any way to put __gshared or immutable into a typedef or alias so that
conditional compilation can allow code to compile with both DMD v1 and DMD v2 ?

I thought something like this would do it:

import std.stdio;

static __gshared uint value1 = 3;
static immutable uint value2 = 4;

version(D_Version2) {
    mixin("typedef static __gshared uint __gshared_uint;");
    mixin("typedef static immutable uint immutable_uint;");
}
else {
    typedef static uint __gshared_uint;
    typedef static uint immutable_uint;
}

__gshared_uint value3 = 5;
immutable_uint value4 = 6;

void main() {
    uint save1, save2, save3, save4;
    asm {
        mov        EAX,value1;
        mov        save1,EAX;
        mov        EAX,value2;
        mov        save2,EAX;
        mov        EAX,value3;
        mov        save3,EAX;
        mov        EAX,value4;
        mov        save4,EAX;
    }
    writefln("save1 %d save2 %d save3 %d save4 %d", save1, save2, save3,
save4);
}

but it does not:
dmd -vtls test03
test03.d(15): value3 is thread local
test03.d(16): value4 is thread local

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prev sibling parent d-bugmail puremagic.com writes:
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Don <clugdbug yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID


--- Comment #3 from Don <clugdbug yahoo.com.au> 2010-01-31 12:17:37 PST ---
Marking this as invalid, since it is an intentional change between D1 and D2.

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